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Mammoth Gray Stripe Sunflower

Huge flowers provide a yummy snack

Mammoth Gray Stripe Sunflower

Huge flowers provide a yummy snack

  • Huge, 8-14 in. flowers
  • Yields a generous seed crop
  • Grows 9-12 ft. tall
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Out of Stock
Product Description

This sunflower is called mammoth for a reason! Flowers grow in at 8-14 inches across (some have reached 20 inches!) and yield a generous crop of seeds. High oil content gives these seeds great roasted flavor. Grows 9-12 feet tall. 100 days to maturity.

Product Details
  • Botanical Name: Helianthus annuus 'Mammoth Gray Stripe'
  • Season: both Spring & Fall
  • Sun/Shade: Full Sun
  • Height: 9 - 12 Feet
  • Spacing: 2 - 4 feet.
  • Zone: 3-9
  • Spread: 15 - 24 inches.
  • Color:Orange-yellow.
  • Foliage:Very rough; to 1 foot long heart-shaped green leaves.
  • Depth:1 inch.
  • Blooms:Mid Summer, Late Summer, Fall
  • Germination: 10 - 14 days at 68 - 86 degrees F.
  • Days to Maturity: 42 Days
  • Fruit: Smooth ivory flesh with delicate flavor.
  • Soil Preference: Dry Soil
  • Growth Rate: Moderate growth rate.
  • Form: Annual, sunflower.
  • Flowers: Bright yellow flowers up to 20 inches in diameter.
  • Seed Count: Approximately 300 seeds per ounce. 1/4 lb. is approximately 1200 seeds. Sold by weight.
  • Size: 1 Oz
Shipping Information

Orders for in-stock seeds and hardgoods are typically shipped within 5 business days.

Plants will be shipped at the proper planting time for your area of the country during the shipping timeframes outlined below:


2021 Fall Shipping Schedule
  Zones   Blueberries All Other Fruits Perennials, Bulbs & Flowers Vegetable Plants
& Starts
1A-4A 9/20/21 - 10/29/21 9/20/21 - 10/29/21 9/20/21 - 10/29/21 9/20/21 - 10/29/21
4B 9/20/21 - 10/29/21 9/20/21 - 10/29/21 9/20/21 - 10/29/21 9/20/21 - 10/29/21
5A 9/20/21 - 10/29/21 9/20/21 - 10/29/21 9/20/21 - 10/29/21 9/20/21 - 10/29/21
5B 9/20/21 - 10/29/21 9/20/21 - 10/29/21 9/20/21 - 10/29/21 9/20/21 - 10/29/21
6A 9/20/21 - 10/29/21 9/20/21 - 10/29/21 9/20/21 - 10/29/21 9/20/21 - 10/29/21
6B 9/20/21 - 10/29/21 9/20/21 - 10/29/21 9/20/21 - 10/29/21 9/20/21 - 10/29/21
7A 9/20/21 - 10/29/21 9/20/21 - 10/29/21 9/20/21 - 10/29/21 9/20/21 - 10/29/21
7B 9/20/21 - 10/29/21 9/20/21 - 10/29/21 9/20/21 - 10/29/21 9/20/21 - 10/29/21
8A & B 9/20/21 - 10/29/21 9/20/21 - 10/29/21 9/20/21 - 10/29/21 9/20/21 - 10/29/21
9A & B 9/20/21 - 10/29/21 9/20/21 - 10/29/21 9/20/21 - 10/29/21 9/20/21 - 10/29/21
10A & B 9/20/21 - 10/29/21 9/20/21 - 10/29/21 9/20/21 - 10/29/21 9/20/21 - 10/29/21
Last Order Date All Grow Zones:
Oct 25, 2021
All Grow Zones:
Oct 25, 2021
All Grow Zones:
Oct 25, 2021
All Grow Zones:
Oct 25, 2021

2021 Shipping Schedule
Zones Nematodes Encapsulated Compost Worms
1A 5/10/21 - 10/29/21 5/10/21 - 10/29/21
1B - 2A 5/10/21 - 10/29/21 5/10/21 - 10/29/21
2B - 3B 4/26/21 - 10/29/21 4/26/21 - 10/29/21
4A - 6A 4/12/21 - 10/29/21 4/12/21 - 10/29/21
6B - 7A 4/5/21 - 10/29/21 4/5/21 - 10/29/21
7B - 8B 3/8/21 - 10/29/21 3/8/21 - 10/29/21
9A - 10B 2/22/21 -10/29/21 2/22/21 -10/29/21
Last Order Date 10/25/2021 10/25/2021

Shipping Note:

The type of product you order or the weather in our area or yours may affect the anticipated shipping schedule.

Trees and shrubs are kept in the nursery row until fully dormant for optimum stress protection.

In all cases, we choose the fastest, most efficient way to send your order--via the U.S. Postal Service or United Parcel Service. Large orders may be shipped in more than one package.

Please note that we cannot ship outside of the continental United States.

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Questions & Answers

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